Everyone knows that glucose is the main fuel for the brain. About 100 grams of this substance a day consumes a human brain weighing 70 kg. About 20–25% of the daily caloric content of a diet is spent on brain activity during intense mental work. The brain needs about 400–500 kcal to maintain vital functions, signaling and reproducing elementary operations. These figures sometimes grow twice and with increased mental activity. Most of all calories are spent if you force a person to solve unusual tasks.
We can feed the intellect only by getting glucose directly from the blood. And it can get into two ways – with food and from the strategic reserves of the body. Also, glucose can be produced by the body from amino acids. We’re gonna explain it in more detail.
Glucose from stocks. It accumulates in the body, in the liver, and muscles as glycogen. And it is the liver reserves glucose intended for the brain, the muscles accumulate reserves for themselves. Insulin inhibits the breakdown of glycogen – this decomposition begins only after the fall of glucose in the blood and reducing the synthesis of insulin. On the contrary, stress contributes to the burning of these stocks.
Glucose from amino acids. The body can use this protein from the food, and in extreme cases coming from muscles. Thus, it is possible to synthesize about 400 g of glucose per day. But it is important to understand that if you don’t eat carbohydrates at all, this process will turn on 10 hours after eating protein foods and gain momentum by the end of the second day.
Therefore, even if you follow a low-carb diet in a period of high intellectual activity, the brain will receive fuel in abundance. Both glycogen stores and glucose synthesis will be use from amino acids. The only exceptions are cases when your brain work a lot and still exercise at the gym until exhaustion. What does this mean? Only that additional sweets besides the dose of carbohydrates measured in a rational diet do not need a person!
Naturally – does not mean useful
If many people are wary of refined sugar, fructose seems to be completely harmless. However, it is not.
Fructose refers to simple carbohydrates, but it differs in its action from sucrose. Fructose does not stimulate the release of insulin, however, in terms of caloric value, it is comparable to sugar. This sweetener contributes to the appearance of extra pounds even more than sucrose, because the excess fructose is sent straight to the fat reserves.
In addition, the abuse of fructose alters lipid metabolism in such a way that visceral fat begins to be deposited to a greater extent in the body. It surrounds the internal organs, including the heart, violating their functions.